Printing press



0611. 3, 1933. A w M N 1,928,815

PRINTING PRESS Filed April 27, 1931 2 Sheets-Sheet 1 INVENTOR:

ARTHUR w GILLMA ATTORNEY.

Oct. 3, 1933. w GlLLMAN 1,928,815

PRINTING PRESS- Filed April 27. 1931 2 Sheets-Sheet 2 INVENTOR; ARTHURw. GILLMAN ATTORNEY.

Patented Oct. 3, 1933 V 1,928,815.. PRINTING PRESS Arthur W. Gillman,Berkeley,- c ne, assignor of one-half to John S. Pinney, San FranciscCalif.

Application April 27, 1931. Serial No. 533,072

2 Claims. (01'. 1o1 's4s) This invention relates to improvements inprinting presses and more particularly to roller trucks for the inkingrolls thereof.

The principal object of the invention is to compensate for variations inthe diameters of the inking rolls.

Another object is to limit the application of ink to the type facesonly, by preventing excess pressure by oversized rolls.

Another object is the independent adjustment of each individual rollrelative to its diameter.

A further object is to provide a sturdy easily adjustable tractionroller applicable to the conventional form of inking roll shaft.

Other objects and advantages will appear as the description progresses.

In this specification and the accompanying drawings the invention isdisclosed in its preferred form, but it is to be understood that it isnot limited to this form because it may be embodied in other forms. Itis also to be understood that in and by the claims following thedescription it is desired to cover the invention in whatsoever form itmay be embodied.

In thetwo sheets of drawings:

Fig. l is a fragmentary perspective view from above of the inkingmechanism of a conventional platen printing press with this inventionapplied thereto.

Fig. 2 is an enlarged detail in vertical section of the adjustabletraction roller and associated parts in the inking assembly.

Fig. 3 is a similar view showing the range of adjustment of the tractionroller.

Fig. 4 is a transverse vertical section of the traction roller.

In detail the construction illustrated in the drawings comprises the bedof a conventional printing press having the guide tracks 1 thereon.These tracks extend vertically on opposite sides of and a definitelymaintained height above the plane of the platen 2. They curve rearwardlyat 3 and incline upwardly at 44 to opposite sides of the ink disc 5.

$ The ink rolls 678 are molded on the axial shafts 910-11 respectively.These shafts protrude at each end of the rolls and are journaled in thetrucks 12--12 and 13 on opposite sides of the bed of the press. Thetrucks 12 are pivoted at 14 to saddle rods 15, which are guided in theroll frames 16 at each side of the press and under spring tension todraw the rolls 67 toward the platen 2 and the ink disc 5, in the usualmanner. The roll 8 is similarly controlled by the rod 17 with likeresults. Where a multipl'icity of ink rolls are used, as illustrated,;it is necessary toseparately mount them as shown, to permit them toflexibly pass the turn in the tracks at 3.

The spring tension of the rods 15-17 is taken by the anti-frictiontraction rollers 18-48 on the shafts 9--10-11. The rolls 678 pick inkoff the disc 5 and deposit it on the faces of the type X, held in theform or chase fixed to the face of-the platen 2, with each cycle ofoperation of 65. the press.

Heretofore it has been the practice to have all the traction rollers18-18 the same diameter.

If the diameters of the rolls 6'78 vary the pressure upon the ink disc 5and the type form will vary accordingly. It is a fact that the nature ofthe composition of the rolls makes it impossible to mold and maintain afixed diameter in these rolls. They are subject to diametric expansionand contraction by atmospheric changes. They are also subject to surfacemutilation by the type faces, especially by brass rules, etc.,

if the pressure is too great, due to larger diameters among the rollers6--7-8.

Obviously the larger rollers will exert a heavier pressure against theink disc 5 and the type faces X. Any excess ink forced below the planeof the type face will be transferred to the imprint. The unequaldistribution of ink by the larger and smaller rolls makes a good imprintimpossible. p

The above and other disadvantages are entirely eliminated by the use ofthis invention.

Broadly stated, the invention consists of a concentric traction rollerwith an eccentrically variable axis.

The structure of the invention comprises the annular concentric roller18, having the concentric center bore 19, see Figs. 2-4. The outer faceof the roller tapers inwardly as at 20, and the inner face iscountersunk to form the annular flange 21.

The bearing of the roller comprises the sleeve 22 with the integralcollar 23 adapted to bear against the inner face 24 of the roller withinthe flange 21. The keyway 25 engages the lugs 26 on the shafts 910-l1 ofthe ink rolls and revolves therewith.

The opposite end of the sleeve is threaded at 27 to receive the threadedcone 28, having the knurled portion 29 to facilitate manual adjustmentof the cone. The adjusted position of the cone is fixed by the set screw30, bearing against the follower 31 engaging the threads 2'7. Thisfollower may be of a suitable bland metal that will not injure thethreads. 9

Advancing or retracting the cone 28 on the sleeve 22 causes it to riseor descend the incline of the taper 20. The height of the cone above thetracks 1 determines the axis of rotation, regardless of the true axis ofthe roller 18. The symmetrical contact between the cone 28 and the taper20 is of such area that there is no bucking tendency in the roller 18 inits travel on the tracks 13. It is advisable therefore to keep thediameters of the cone and roller as nearly equal as may be. The rollingcontact between these two parts reduces the friction to the minimum. Itis manifest that the center opening 19 could be counter tapered at 24and opposed cones used, without departing from the spirit of thisinvention.

Having thus described this invention what is' claimed and desired tosecure by Letters Patent is.

1. In combination with an inking roller; an annular traction rollerhaving one side thereof tapered toward its central opening; a sleevesplined to the shaft of said inking roller and extending through thesaid opening and having a collar engaging the side of said tractionroller opposite from said taper; a conical bearing axially threaded onsaid sleeve and engaging said taper; and a setscrew extending radiallythrough said bearing and impinging on said sleeve.

2. In combination with an inking roller; an annular traction rollerhaving one side thereof tapered toward its central opening and alaterally extending flange on the opposite side thereof; a sleevesplined to the shaft of said inking roller, extending through saidopening, and having a collar impinging on the side of the rolleropposite said taper and overhung by said flange; a conical bearingaxially threaded on said sleeve and engaging said taper; a setscrewextending radially through said bearing; and a follower of soft metalinterposed between said setscrew and the threads of said sleeve.

ARTHUR W. GILLMAN.

